#920 StackOverflow with generic subclass suspend fun stubbing

modules/mockk/src/commonTest/kotlin/io/mockk/it/GenericSubclassTest.kt

@@ -0,0 +1,46 @@
+package io.mockk.it
+
+import io.mockk.coEvery
+import io.mockk.mockk
+import kotlinx.coroutines.ExperimentalCoroutinesApi
+import kotlinx.coroutines.test.runTest
+import org.junit.jupiter.api.Test
+import kotlin.reflect.KClass
+import kotlin.test.assertEquals
+
+
+@OptIn(ExperimentalCoroutinesApi::class)
+class GenericSubclassTest {
+
+    /**
+     * See https://github.com/mockk/mockk/issues/920
+     */
+    @Test
+    fun `StackOverflow minimal setup`() = runTest {
+        val repo = mockk<RepositoryToMock> {
+            coEvery { create(any()) } coAnswers { true }
+        }
+
+        assertEquals(
+            true,
+            repo.create(JsonModel()),
+        )
+    }
+
+}
+
+
+private class JsonModel
+
+private class RepositoryToMock :
+    AbstractRepository<JsonModel>("Collection", JsonModel::class)
+
+private abstract class AbstractRepository<T : Any>(
+    private val collectionName: String,
+    private var clazz: KClass<T>
+) {
+
+    open suspend fun create(model: T): Boolean {
+        return true
+    }
+}